Question

Whenever a mixture of gases is allowed to come in contact with a particular adsorbent under the same conditions, the more strong adsorbate is adsorbed to a greater extent irrespective of its amount present. For example, $H_{2}O$ is adsorbed to more extent on silica gel than $N_2$ and $O_2$. This shows that some adsorbates are preferentially adsorbed. It is also observed that preferentially adsorbable adsorbents can displace a weakly adsorbed substance from the surface of an adsorbent.

Which of the following gases is adsorbed to maximum extent :

• A. $He$
• B. $Ne$
• C. $Ar$
• D. $Xe$

Answer 1

The correct option is D $Xe$

Adsorption :

The phenomenon of attracting and retaining the molecules of a substance on the surface of a liquid or a solid resulting into a higher concentration of the molecules on the surface is called adsorption. As a result of adsorption, there is a decrease of surface energy. The process of removal of an adsorbed substance from the surface on which it is adsorbed is called desorption. It is the reverse of adsorption and can be brought about by heating or by reducing the pressure.

Whenever a mixture of gases is allowed to come in contact with a particular adsorbent under the same conditions, the more strong adsorbate is adsorbed to greater extent irrespective of its amount present, e.g.,$H_{2}O$ is adsorbed to more extent on silica gel than $N_2$ and $O_2$
Here, among given gases Xe is most reactive so it will adsorbed to greater extent.